The locks must be catching keeps on frame, first sight the door sash to frame, should be level if it's out of line this could be the trouble. I think you are going to have to deglaze the door, then you will have a bit of movement & it should unlock. Don't put excess pressure on handle you will do more damage.
When refitting glass make sure you pack it in toe & heel fashion.
Len
April 2011
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